• Gossen Metrawatt

SIRAX BM1250 - Advanced

Vielen Dank für Ihr Interesse! Wir werden uns umgehend um Ihre Anfrage kümmern.

Data protection

We attach great importance to data protection!
Read more here in our Privacy Statement

Item number: 182866

Multifunctional measuring device for network parameters

The multifunctional power and monitoring instrument SIRAX BM1250 is suitable for fixed installation and for the measurement of the most important electrical parameters in low-voltage systems.
  • Multifunctional measuring device for network parameters
  • Multifunctional measuring device for network parameters

The measurement is designed for 1- or 3-phase networks with 2-, 3- or 4-wire connections and are used to safely monitor the electrical distribution. The measured values are displayed on the generous LCD display. The device (96x96mm) has two optional outputs that can be configured as a pulse output for energy measurement, limit output, timer function or relay output. An RS485 interface with Modbus / RTU is also available.

Product Highlights


  • The device can be operated very easily via 3 pushbuttons
  • With its large, backlit LCD display, the measured data is very easy to read
  • The User Assignable Screens feature lets you define 1 to 10 on-screen displays out of 28 screens
  • Easy, flexible and quick installation thanks to Easy Clip or mounting brackets


  • Variety of functions for measuring voltage, current, power, energy and quality
  • Various relay functions integrated (pulse output for energy measurement, limit value output, timer function, RTC relay output)
  • Built-in 8MB Flash Datalogger (event logging, time logging, load profile logger)
  • On-site configuration (configuration via pushbuttons, USB interface or via RS485 / Modbus RTU possible)
  • Easy integration into higher-level systems through open communication via Modbus RTU


  • RS485 interface with Modbus / RTU protocol


  • Password protects against unauthorized modification of programming and configurations
  • No password given from factory default side


  • Display and control of electrical characteristics in power distribution systems
  • Internal energy billing/monitoring/auditing
  • Submetering and utility billing
  • Electrical load monitoring
  • Technical characteristics


    • Current (I1, I2, I3, IN, ISystem)
    • Voltage (U1, U2, U3, USystem, U12, U23, U31)
    • Frequency (f)
    • Power (P1, P2, P3, ΣP, Q1, Q2, Q3, ΣQ, S1, S2, S3, ΣS)
    • Power factor (PF1, PF2, PF3, ΣPF)
    • Phase angle (Cosϕ1, Cosϕ2, Cosϕ3, ΣCosϕ)


    • Total harmonic distortion (THDI1, THDI2, THDI3, THDISystem, THDU1, THDU2, THDU3, THDUSystem)
    • Harmonics up to the 31st harmonic (I1, I2, I3, U1, U2, U3)


    • Active energy (kWh Import/Export)
    • Reactive energy (kvarh Import/Export)
    • Apparent energy (kVah)
    • Run and On hour counter
    • Built-in Real Time Clock
    • Time-based data logger


    • Phase absent indication
    • Phase reversal indication (clockwise/counter clockwise)
    • Number of interruptions


    • Communication RS485 Modbus RTU
    • Relay output (pulse, limit, timer, RTC)


Do you have any questions on the product or do you need technical information or details on the current delivery period? Our sales backoffice will be pleased to assist you.

Sales International:
Telephone: +49 911 8602-0
Send message


Under myGMC you can register your product and receive up-to-date information on firmware updates, modifications of standards and many more topics.

Dialogue, Information and Actions: